Winston Singleton (Prototype)

winston-singleton-prototype.js

const winston = require('winston');

const Logger = (function() {
  var instance;

  function Logger() {}

  Logger.prototype.logger = new winston.Logger({
    exitOnError: false,

    transports: [
      new winston.transports.Console({
        handleExceptions: true,
        json:             process.env.NODE_ENV == 'production'
      })
    ]
  });

  return {
    getInstance: function() {
      if (instance == null) {
        instance = new Logger();

        instance.constructor = null;
      }

      return instance;
    }
 };
})();

module.exports = Logger.getInstance().logger;